Only plants need cell walls, animals do not. Cell walls help maintain cell shape in plants, while the cell membrane helps support animal cells.
Maybe because these particular cells die faster than other cells in the body, for example the receptors cells in your nasal cavity only lasts for about 3-4 weeks and after that it dies, therefore new news are formed every week in order to keep your nasal cavity from deteriorating your smell ability.
Some blood cells only lasts for about 120 days that's why new cells are formed and produced, faster production means faster cell division.
It depends on the type of cell and the current situation of those cells.
The answer is Ordovician-Silurian.
The mass extinction thaw was most likely caused by the extinction that was most likely caused by the formation and retreat of glacier was the Ordovician-Silurian extinction. It is the second largest among the five major extinction events.
Answer:
B
Explanation:
Birds are vertebrates and they also have feathers and reproduce by laying eggs. Additionally, they are also warm blooded.
